def test_Course21(self):
     co = Course("CS-337", "004", ["M", "W"], "11:00", "11:50",
                 ["001", "002", "003"])
     with self.assertRaises(ValueError) as ctx:
         co.lab_sections = ["abs", "001", "r34"]
     self.assertEqual("Lab sections must be a three digit number",
                      str(ctx.exception))
 def test_Course19(self):
     co = Course("CS-337", "004", ["M", "W"], "11:00", "11:50",
                 ["001", "002", "003"])
     co.lab_sections = ["008", "009"]
     self.assertEqual(co.lab_sections, ["008", "009"])